This IS NOT a Buffet or Yamaha so you have to accept that the build quality will not be at that standard. It had a few niggles - like swarf peelings in the crook and bell and neck receiver and a bent low C lever arm. Some of the point screws were loose and others have been overtightened and rammed into the mounting posts. The bell did not fit the lower joint well and the cork needed sanded.
Nothing that can't be sorted out in a couple of hours work. The mouthpiece that comes with it should be replaced right off with a Yamaha or better, it's just not that good and does the instrument a disservice.
Once the niggles were sorted out it was good to play, has a nice tone, it plays easily up into the Altissimo and is relatively light compared with my old Selmer. After a year of playing the clarion F# is squeaking badly and it needs a trip to the repair shop to regulate it.
The instrument is built to a price point and you get a bass clarinet for around £2k and there is not a lot in this range so JP are filling an important gap. I play it hard and often and it's holding up well enough.
Needs - a better sling arrangement with a second hook point, a single sling point is not adequate for a long instrument like this.
Case is OK but the inside padding is poor.

I bought this Bass Clarinet to replace a Yamaha to low E flat. I needed the lower notes that a low C would offer me. Buffet and Selmer were out of my price range. The instrument needed some adjustment when I got it home which was a pity. However my repairer is very good and soon got it up and running. Since then I have found it very relieble. It has a lovely tome in the lower register and also in the upper register. The extra venting makes the upper register nice and clear. The lower three semitones mechanism is easilt adapted to. I recommend this Bass to anyone. It is good value for money..